Two metal balls have charges of 7.1 × 10-6  coulombs and  6.9 × 10-6  coulombs. they are 5.7 × 10-1  meters apart. what is the force of interaction between the two balls?   (k  = 9.0 × 109  newton·meters2/coulomb2) 5.7 newtons 6.9 newtons 7.1 newtons 1.4 newtons

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel

Why is no-till farming more sustainable than many traditional methods of farming